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While smart contracts are becoming widely recognized as the most successful application of the blockchain technology that could be applied into various industries and for different purposes such as e-commerce, energy tradings, assets management, and healthcare services, their implementation has posed several challenges insofar that they could handle large amount of money and digital assets in addition to their ability to manipulate critical data and transactions related information which makes them attractive targets of security threats and attacks that could lead to significant problems like money losses, privacy leakage and data breach. To better deal with such issues, reasoning about the correctness, the safety and the functional accuracy of smart contracts before their deployment on the blockchain network is critical and no important than ever. In this context model checking tools are well adopted for the formal verification of smart contracts in order to assure their execution as parties' willingness as well as their reliable and secure interaction with users. In this direction, this paper uses Event-B formal verification method to formally model solidity written smart contracts in order to verify and validate their safety, correctness and functional accuracy in addition to their compliance with their specification for given behaviors. The verification is conducted using a model checking tool along which expected safety properties are formalized, validated and judged to be satisfied or unsatisfied. To illustrate the proposed approach, its application to a realistic industrial use case is described.

While smart factories are becoming widely recognized as a fundamental concept of Industry 4.0, their implementation has posed several challenges insofar that they generate, process, and exchange vast amounts of security critical and privacy sensitive data, which makes them attractive targets of attacks and unauthorized access. Security requirements in such scenario include integrity, confidentiality, traceability and notarization of exchanged data in the one hand plus access control, privacy and trust in the other one. In this context, we design a distributed resource management framework using the emerging smart contracts technology for Industry 4.0 applications and more specifically for smart factories environments. This last, named DRMF, utilizes three Ethereum smart contracts specifically a Governance Contract (GC), an Access Contract (AC) and a Lookup Contract (LC) that are respectively responsible for the registration of new joining entities as well as those requesting consensus partaking permissions, second the dynamic access authorization and third the mapping between the required services and contracts ensuring their management. Using the blockchain technology, this framework is expected to achieve distributed, flexible, verifiable and trustworthy access control in addition to a transparent, traceable and notarized resource usage and sharing. Results from a real implementation plus performance evaluation prove the proposed concept and demonstrate its feasibility.